The present research reports the first record in Poland of the alien invasive and quarantine species Chaetosiphon (Pentatrichopus) fragaefolii (Cockerell, 1901) – the strawberry aphid. Native to North America, it is a critical pest and viral vector associated with strawberry crops. This study provides valuable insights into the genetic and morphological characteristics of the strawberry aphid. By integrating morphological and molecular analyses, the taxonomic resolution has been improved and deepened the understanding of this economically important species, particularly its genetic diversity, distribution, and potential invasion routes. For the first time, scanning electron microscopy (SEM) analyses were performed to elucidate the general morphology, chaetotaxy, and sensilla of the antennae and mouthparts of this species, providing a better understanding in the context of its natural and chemical control.